109 research outputs found
The effect of nano-SiC on characteristics of ADC12/nano-SiC composite with Sr and TiB addition produced by stir casting process
No full textAl-Si/SiC Metal Matrix Composites Produced by Spontaneous Infiltration
No full textAluminium Silicon reinforced with 50Vf% SiC has been produced by spontaneous infiltration at 900°C for 1 hour. Aluminium infiltrated preforms containing 1%wt Mg mixed with various of Si between 2 and 14wt%, as external dopant. However Al did not infiltrate a preform containing 1wt%Mg but if mixed with Si in the preform generated in more extensive infiltration. Effect of Si on characterisation of pure Al composites by spontaneous infiltration were studied and compared to Al-Si based matrix. Microstructural analysis of MMC as well as mechanical properties were also observed. It was found that increasing of Si content generated lower porosity thus increasing hardness due to aluminium could wet SiC preform well. Although the dopant was uniformly distributed throughout the perform but microstructural analysis and hardness measurements indicate that the resultant composite may not be uniform as infiltration inwards from the top to the bottom of preform.The hardness of Al-Si composites is significantly increased with increasing of Si for both externally and internally doped system. This is associated with decreasing porosity with higher Si in composites.</jats:p
Effect of Sr addition on the microstructure and mechanical properties of ADC12/nano Al2O3 composites produced by stir casting method
No full textEffect of nano silicon content in half-cell Li-ion batteries performance with Li4Ti5O12 xerogel TiO2 solid-state anode materials
No full textEffect of SiC particles on mechanical properties of aluminum ADC12 composite through stir casting process
No full textDevelopment of Seamless Pipe Based on Al/Al2O3 Composite Produced by Stir Casting and Centrifugal Casting
No full textAluminum with Al2O3 material has high strength and light weight. In this study, the
aluminum is used with Al2O3 material as an alternative material seamless pipe. The making of this
material seamless pipe is through the stir casting process and centrifugal casting process. The
results show that the addition of reinforcing and spin method increases the mechanical properties of
the cast. Influences of process-variables are analyzed using the microstructure observation. The
observations show that there formed a new phase, i.e. MgO and MgAl2O4. The new phase will
improve wettability and mechanical properties of the composites. The hardness value of composites
growing with the increasing of the Vf% Al2O3 and the centrifugal process. The highest hardness is
achieved by 47 HRB with 5%Vf Al2O3-3 wt% Mg. Expected results of aluminum composite with
ceramic particles reinforcement design is to obtain a composite material, which have superior mechanical
properties, such as strength, hardness, high temperature resistant and light weight. The material can be
applied as an alternative material for tube and pipe products. Initially, the product materials are made of steel
and now can be replaced using composite Al/Al2O3
Effect of Firing Temperature and Holding Time on Characterization of Al/SiC Metal Matrix Composites Produced by Pressureless Infiltration.
Get PDFEffect of Firing Temperature and Holding Time on Characterization of Al/SiC Metal Matrix Composites Produced by Pressureless Infiltration. The production of Al-SiC metal matrix composite can be carried out by pressureless metal infiltration processs (PRIMEX). The experiment was conducted using aluminium AC2B ingot as a matrix and 50%Vf SiC powder as a reinforcement which is mixed with 10% Mg powder for wetting agent. The variables of this experiment are holding time and firing temperature to investigate the effect of these conditions on mechanical properties of Al-SiC metal matrix composites. Holding time was conducted for 2,5,8,10,12 hours and firing temperatures was 750, 800, 900, 1000, 1100°C respectively.. The composites produced are analysed both mechanical properties and metalography such as densities, porosities, hardness, as well as wear rate. The results showed that the longer holding time and increasing firing temperature will increase mechanical properties of Al-SiC metal matrix composites, and it is found that the optimum mechanical properties at 1000°C for 10 hour
Effect of Aging on Characterization of Sr-Modified Stir Cast A356/Al<sub>2</sub>O<sub>3</sub> Composite
No full textA356/Al2O3 composites with Sr modifier were produced by stir casting process. The composites were further heat treated to obtain light material with superior characteristics through precipitation hardening of Mg2Si precipitate. The A356 alloy is reinforced with 10 %Vf Al2O3 micro particles. Small amount of Sr is added to modify eutectic silicon morphology from plate-like into fibrous. The composites were prepared by stir casting method in order to obtain dispersed reinforcement particulates within the matrix. T6 heat treatment is employed to the fabricated composites for 2, 4, 6, 8, and 10 hours of aging time to improve the properties. The result reveals that an optimum values of tensile strength, impact strength, hardness and wear rate are achieved by conducting 6 hours of aging. Longer than that, the properties will decline as a result of incoherent phase domination. Small amount of Sr is shown to be able to change the morphology of eutectic silicon from plate-like into fibrous. However, Fe-intermetallics formation, porosity, and negative effect from solution treatment due to improper technical condition during heat treatment are found to contribute on deterioration of mechanical properties of the material.</jats:p
Synthesis Optimization of Cathode Precursor Ni0,5 Mn0,4 Co0.1 (OH)2 with Coprecipitation Method
Get PDFThe use of conventional fuels such from fossils sourced is non-renewable energy, which makes this energy source less environmentally friendly. The battery that is nowadays used widely is the Lithium-Ion type with variations in the type of electrode. Electrodes have an important role in battery performance, especially at the cathode. Predecessor cathode types such as LiCoO2, LiMnO, and LiNiCo have various disadvantages due to their dangerous nature, insufficient capacity, and poor stability. NMC cathode (NiMnCo), in this case, NMC541 is presented to overcome these deficiencies. The process of making NMC541 cathode can be done by various synthesis methods, one of which is Co-precipitation. The synthesis parameter directly influences the performance of the cathode precursor produced, especially on its microstructure. For that, we try to optimize the synthesis parameters, such as Stirring Speed, and Aging time. The result said that samples with 900 Rpm stirring speed give the best product precursor along to their small size particle and good conductivity. Meanwhile, Aging co-precipitation doesn’t significantly affect coprecipitation precursor products
Effect of Artificial Aging (T6) on Microstructure of Al-AC8H/Al<sub>2</sub>O<sub>3</sub> MMC Produced by Stir Casting Route
No full textThe purpose of this research is to systematically study the influence of artificial aging (T6) on evaluation of microstructure changed and hardness of Al-Al2O3 composite produced by stir casting route. The Al2O3 particle reinforced previously was coated by electroless coating method to improve wetting system between Al-AC8H and Al2O3 when aluminium composites fabricated by stir casting route. The volume fraction of Al2O3 which added into Al melts was various from 2% to 22.5%. The stirring process was carried out at 500-700 rpm to achieve vortex in alumnium melt using graphite impeller for 15 minutes. The prepared aluminium composites then heat treated by T6 treatment with different aging time. Microstructure and hardness after T6 treatment were investigated. It was observed that microstructure changed after T6 while hardness increase after T6 due to the Mg2Si precipitation hardening was present in Al matrix as well as Si eutectic accumulated on the surface of Al2O3. It was found that the optimum hardness occurred after aging for 3 hours.</jats:p
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